Re: shooting in the heat?
Yep, you talked youself into the solution.....
Method one w/bipod: Elbows solidly placed on the ground abd pull straight back firmly w/the trigger handturns out to be fairly good.
Method two w/bipod: construct a beanie bag, from the beads/stuffing of beanie babies, (found @ craft/Wally World/K-Mart stores). Put this under the butt stock and squeeze with non-trigger hand for elevation adjustments.
Works much much better for me than method one or most other methods.
I hook my beanie bag to my belt loop w/caribiner(?) thus its always handy and its lighter than sand and doesn't swell like rice should it get wet.
A lot of people use an old sock. I chose a small stuff bag found in the area of camping equipment at Sportmans or some such place.
Good luck seems like you're on the proper path to a successful hunt.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!